Prefabricated sedimentation device, rainwater collection tank with sedimentation device and rainwater collection method

Abstract

This invention discloses a prefabricated grit settling device, a rainwater collection tank with a grit settling device, and a rainwater collection method thereof. The device includes a base plate and, from the outside to the inside, an outer annular baffle, an inner annular baffle, and a central annular baffle concentrically arranged on the base plate. A water inlet device is arranged on the sidewall of the outer annular baffle. A grit settling zone is formed between the outer and inner annular baffles. Multiple prefabricated filter plates are detachably installed within the grit settling zone. Each prefabricated filter plate has a filter plug hole, and a filter plug is installed in each of the filter plug holes. An overflow groove is formed at the top of each prefabricated filter plate. The filter plug is located below the overflow groove. A filtration zone is formed between the inner and central annular baffles. This solution effectively solves the problems of difficult construction and low grit settling efficiency in existing grit settling tanks.

Description

Technical Field

[0001] This invention belongs to the field of farmland irrigation technology, specifically relating to a prefabricated sedimentation device, a rainwater collection bucket with sedimentation device, and a rainwater collection method thereof. Background Technology

[0002] Drought and water scarcity are bottleneck factors for agricultural development on the Loess Plateau. Constructing rainwater harvesting cellars and other water storage facilities can effectively solve agricultural irrigation and drinking water problems for people and livestock. However, the construction of concrete and brick-built water cellars is complex, costly, and difficult to clean, hindering their development and application. With the advent of rotational molding technology, one-piece molded polyethylene water tanks are increasingly being used for rainwater storage. Because polyethylene water tanks are lightweight, have good sealing properties, and high strength, they offer significant advantages in manufacturing, transportation, and use. Before rainwater enters the storage facility, it needs to undergo sedimentation and filtration to reduce the amount of sediment and other impurities carried in the rainwater.

[0003] Previously, the problem of water and sand separation was solved by excavating rectangular or cylindrical sedimentation tanks between the confluence channel (pipeline) and the rainwater collection silo. However, the construction of this type of sedimentation tank requires building materials such as cement and mortar, which is difficult to construct on hilly slopes and requires additional land, thus hindering its application. The invention "A Mountain Rainwater Harvesting Irrigation System" (authorization announcement number: CN208748747U) discloses a mountain rainwater harvesting irrigation system, including a sedimentation tank, a collection tank, and a clear water tank. The sedimentation tank is connected to the top of the collection tank via a water pipe. The collection tank has, from top to bottom, a grid layer, a plant cultivation layer, a quartz sand layer, a gravel filter layer, a pebble layer, and a waterproof layer, which can filter floating matter and particulate suspended turbidity in rainwater, filtration, purification, and storage. In this system, the sedimentation tank mainly relies on gravity for sedimentation, and the sedimentation efficiency needs improvement. The removal of other impurities mainly depends on the collection tank. The invention "A High-Efficiency Water-Saving Irrigation System for Rainwater Harvesting in Karst Areas" (Authorization Announcement No.: CN204560463U) discloses a rainwater harvesting irrigation system comprising a collection system, a sedimentation and filtration tank, a water storage tank, and an outlet pipe. The sedimentation and filtration tank is connected to the water storage tank, and sedimentation mainly relies on gravity. Furthermore, cleaning the sediment entering the rainwater harvesting tank is generally done manually; therefore, improving the sedimentation efficiency of the sedimentation tank and enhancing the ease of cleaning have become urgent practical problems to be solved. Summary of the Invention

[0004] The purpose of this invention is to solve the problems existing in the prior art mentioned above, and to provide a prefabricated grit settling device, a rainwater collection tank with a grit settling device and a rainwater collection method thereof. This device solves the problems of high construction difficulty and low grit settling efficiency in the prior art.

[0005] To achieve the above objectives, the present invention provides a prefabricated sand settling device, comprising a base plate and an outer annular baffle, an inner annular baffle, and a central annular baffle arranged concentrically on the base plate from the outside to the inside.

[0006] The outer annular baffle is equipped with a water inlet device, and a sedimentation zone is formed between the outer and inner annular baffles. Multiple assembled filter plates are detachably installed in the sedimentation zone. Each assembled filter plate has a filter plug hole, and a filter plug is installed in the filter plug hole. Each assembled filter plate has an overflow groove at its top. The filter plug is located below the overflow groove of the filter plate.

[0007] A filtration zone is formed between the inner annular baffle and the central annular baffle, and several filter plates are arranged in the filtration zone along the water flow direction.

[0008] An outflow zone is formed inside the central annular baffle, and an outflow port for draining rainwater is provided on the bottom plate corresponding to the outflow zone.

[0009] As a preferred embodiment, it also includes a vertical structural baffle, one end of which is connected to an outer annular baffle and the other end of which is connected to a central annular baffle. The vertical structural baffle is perpendicular to the bottom plate and arranged along the radial direction of the outer annular baffle. The water inlet device is located on the outer annular baffle on the side closest to the vertical structural baffle.

[0010] As a preferred embodiment, a plurality of concentrically arranged intermediate annular baffles are provided between the outer annular baffle and the inner annular baffle. The intermediate annular baffles are used to divide the space between the outer annular baffle and the inner annular baffle into multiple annular sedimentation zones. The width of the annular sedimentation zones gradually decreases from the outside to the inside along their own radii.

[0011] As a preferred embodiment, the intermediate annular baffle includes intermediate annular baffle I and intermediate annular baffle II, wherein a first sedimentation zone is formed between the outer annular baffle and the intermediate annular baffle I;

[0012] A second sedimentation zone is formed between the intermediate annular baffle I and the intermediate annular baffle II;

[0013] A third sedimentation zone is formed between the intermediate annular baffle II and the inner annular baffle;

[0014] The outer annular baffle, the middle annular baffle I, the middle annular baffle II, the inner annular baffle, and the central annular baffle are all hollow cylinders with their radii decreasing sequentially.

[0015] The widths of the first, second, and third sedimentation zones decrease sequentially along their own radii.

[0016] The vertical structure baffles are connected to the outer annular baffle, the middle annular baffle I, the middle annular baffle II, the inner annular baffle, and the central annular baffle.

[0017] As a preferred embodiment, several first assembled filter plates are detachably installed radially along the outer annular baffle in the first sedimentation zone.

[0018] Within the second sedimentation zone, several second assembled filter plates are detachably installed radially along the outer annular baffle.

[0019] Within the third sedimentation zone, several third prefabricated filter plates are detachably installed radially along the outer annular baffle.

[0020] The top of the first assembled water filter plate, the second assembled water filter plate, and the third assembled water filter plate are all provided with water filter plate overflow grooves;

[0021] The top of the side of the middle annular baffle I that contacts the vertical structural baffle is provided with a first baffle overflow groove, and the first baffle overflow groove is arranged on the other side of the vertical structural baffle opposite to the water inlet device.

[0022] A second baffle overflow groove is provided at the top of the side of the middle annular baffle II that contacts the vertical structural baffle. The second baffle overflow groove is arranged on the other side of the vertical structural baffle relative to the first baffle overflow groove.

[0023] An inner baffle overflow groove is provided at the top of the side of the inner annular baffle that contacts the vertical structural baffle. The inner baffle overflow groove and the first baffle overflow groove are located on the same side of the vertical structural baffle.

[0024] As a preferred embodiment, the sidewall of the central annular baffle is formed with a drain outlet, and the central angle corresponding to the opening length of the drain outlet along the circumferential direction of the central annular baffle is less than 180°; a plurality of filter plates are provided in the filtration zone, the filter plates are arranged radially along the central annular baffle, one side of the drain outlet is connected to the vertical structure baffle, and the other side is connected to one of the filter plates.

[0025] As a preferred embodiment, the water inlet device includes an inlet pipe and a solenoid valve. The solenoid valve is used to control the opening and closing of the inlet pipe. A level switch is also installed in the outflow zone. The level switch is used to detect the liquid level in the outflow zone and send the liquid level signal to the solenoid valve. When the sedimentation process is blocked or the rainwater collection tank is full of rainwater, causing the water level in the outflow zone to rise to a certain height, the level switch sends a closing signal to the solenoid valve, at which point the solenoid valve closes. When the water level drops to a certain height, it sends an opening signal to the solenoid valve, at which point the solenoid valve opens again, and rainwater can re-enter the sedimentation device.

[0026] The second objective of this invention is to provide a rainwater collection bucket with a prefabricated sedimentation device, comprising a rainwater collection bucket and a prefabricated sedimentation device as described in any of the above claims; the top of the rainwater collection bucket is connected to the bottom of the base plate, and the rainwater collection bucket is connected to the outlet.

[0027] The third objective of this invention is to provide a rainwater collection method for a rainwater collection tank with a prefabricated sedimentation device, the specific steps of which are as follows:

[0028] Step 1: Water flows from the inlet device into the first sedimentation zone between the outer annular baffle and the middle annular baffle I. Then it moves along the first sedimentation zone and encounters the first assembled filter plate. When the water level is low, the water can directly seep from the filter plug to the next annular sedimentation section. The filter plug is used to directly filter the rainwater. After the water level reaches the height of the overflow groove of the filter plate at the top of the first assembled filter plate, the water overflows from the overflow groove to the next annular sedimentation section. Silt and gravel remain in front of the first assembled filter plate.

[0029] Step 2: After passing through multiple first assembled filter plates, the water flows through the first baffle overflow channel and filter plug into the second sedimentation zone between the middle annular baffle I and the middle annular baffle II to continue settling, while silt and gravel are left in front of the second assembled filter plates.

[0030] Step 3: After passing through multiple second-assembly filter plates, the water flows through the second baffle overflow channel and filter plug into the third sedimentation zone between the middle annular baffle (II) and the inner annular baffle to continue settling, while silt and gravel are left in front of the third-assembly filter plate.

[0031] Step 4: After passing through multiple third-assembly filter plates, the water flows through the inner baffle overflow channel and filter plug into the filtration zone between the inner annular baffle and the central annular baffle. Then it continues to move along the filtration zone, and after passing through the filter plates, most of the mud or impurities that could not be deposited are filtered out. After filtration, the water flows into the outlet at the bottom center of the outflow zone and enters the rainwater collection bucket.

[0032] Step 5: After the rainfall ends and the inlet pipe stops supplying water, the water in the sedimentation zone can seep through the filter plug to the next sedimentation zone. The water in the last sedimentation zone seeps through the filter plug to the filtration zone and the outlet zone. After being filtered by the filtration zone, the water enters the rainwater collection tank from the outlet.

[0033] As a preferred embodiment, in step four, the level switch is used to detect the liquid level in the outflow zone and send the liquid level signal to the solenoid valve. When the sedimentation process is blocked or the rainwater collection tank is full of rainwater, causing the water level in the outflow zone to rise to a certain height, the level switch sends a closing signal to the solenoid valve, at which point the solenoid valve closes. When the water level drops to a certain height, it sends an opening signal to the solenoid valve, at which point the solenoid valve opens, and rainwater can enter the sedimentation device.

[0034] Compared with the prior art, the present invention has at least the following beneficial effects:

[0035] Firstly, the present invention provides a prefabricated grit removal device. During rainfall, rainwater flows through the collection surface and enters through the inlet device. After filtration through the sedimentation of the multi-stage grit removal zone and the filtration of the filtration zone, the water flows out from the outlet at the center of the bottom of the outlet zone. After rainfall, the prefabricated filter plate can be pulled out or lifted to easily clean and discharge the silt and gravel deposited in the flow channel. The grit removal process is relatively simple, achieving convenient and effective grit removal while reducing labor costs. The present invention also provides a rainwater collection tank with a prefabricated grit removal device. The prefabricated grit removal device is assembled and fixed onto the polyethylene rainwater collection tank through parts. The detachable design makes installation and transportation more convenient. At the same time, the collected rainwater will flow into the rainwater collection tank for storage.

[0036] Secondly, in this invention, each sedimentation zone is divided into several fan-shaped sedimentation sections by a prefabricated filter plate. The bottom of the filter plate is perforated and fitted with filter plugs. Similarly, the bottom of the circular baffle between the last fan-shaped sedimentation section of each sedimentation zone and the primary fan-shaped sedimentation section of the next sedimentation zone is also perforated and fitted with filter plugs. The two adjacent sedimentation zones, the baffles between them, and the filter plugs at the bottom of the baffles form a multi-stage communicating vessel structure. The outlet of the filtration zone is the end of the communicating vessel structure, and its water level is the lowest point of the entire sedimentation tank. After rainwater enters the sedimentation tank, it will spontaneously flow from the higher water level of the sedimentation zone to the lowest water level of the outlet. No water will accumulate at the bottom of the sedimentation tank. Through reasonable structural design, this solution not only realizes spontaneous sedimentation filtration by utilizing the structure of the communicating vessel, but also ensures a high sedimentation efficiency to a certain extent.

[0037] Thirdly, this invention optimizes the rainwater collection method. By cooperating with the aforementioned specific structured sedimentation device, the rainwater collection method of this scheme allows for spontaneous, step-by-step sedimentation through multiple surrounding sedimentation zones. During the sedimentation process, when rainwater exceeds the overflow trough, it can enter the next sedimentation zone or filtration zone through the overflow trough. When rainwater does not exceed the overflow trough, it is filtered through the filter plug. Finally, the rainwater flows into the filtration zone to uniformly filter out unsettled mud, sand, or impurities. The filtered rainwater flows into the rainwater collection tank for collection. At the same time, a solenoid valve is installed in the inlet channel, and a level switch is installed in the outlet zone. When the level switch detects that the liquid level exceeds the set value, it automatically closes the solenoid valve, thereby lowering the liquid level in the outlet zone. When the liquid level in the outlet zone is lower than the set value, the solenoid valve can be opened to raise the liquid level in the outlet zone, thereby ensuring the continuous stability of sedimentation and improving the sedimentation efficiency to a certain extent. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the overall structure of the assembled sedimentation device of the present invention.

[0040] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0041] Figure 3 This is a top view of the structure of the present invention.

[0042] Figure 4 This is a side view of the present invention.

[0043] Figure 5 This is a schematic diagram of the overall structure of the first assembled water filter plate of the present invention.

[0044] Figure 6 This is a schematic diagram of the filter plug of the present invention.

[0045] Figure 7 This is a schematic diagram of the structure of the fan-shaped annular grid hollow filter area of ​​the present invention.

[0046] Figure 8 This is a cross-sectional view of the base plate of the present invention when it is conical.

[0047] Figure 9 This is a schematic diagram of the overall structure of the rainwater collection bucket with a prefabricated sedimentation device according to the present invention.

[0048] Figure 10 This is a schematic diagram showing the location of the sand discharge port in this invention;

[0049] The diagram shows the following markings: 1. Base plate; 2. Outer annular baffle; 3. Inner annular baffle; 4. Central annular baffle; 5. Filtration zone; 6. Outflow zone; 7. Outflow port; 8. First filter plate; 9. Second filter plate; 10. Vertical structure baffle; 11. Assembled filter plate; 12. Filter plate overflow groove; 13. Drain outlet; 14. Water inlet device; 15. Inner baffle overflow groove; 16. Middle annular baffle I; 17. Middle annular baffle II; 18. First sedimentation zone; 19. Second sedimentation zone; 20. Third sedimentation zone; 21. 1. First baffle overflow channel; 22. Second baffle overflow channel; 23. Filter plug hole; 24. Filter plug; 25. Float level switch; 26. Assembled filter plate mounting slot; 27. Handle; 28. Cylindrical base; 29. ​​Rain collection bucket; 5-1. Fan-shaped ring grid hollow filter structure; 5-1-1. Drawer-type side plate; 11-1. First assembled filter plate; 11-2. Second assembled filter plate; 11-3. Third assembled filter plate; 14-1. Inlet pipe; 14-2. Solenoid valve; 15. Sand discharge port. Detailed Implementation

[0050] The present invention will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0051] It should be noted that, unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "a," "an," or "the," and similar words used in the specification and claims of this patent application do not express a limitation of quantity, but rather indicate the presence of at least one. Terms such as "comprising" or "including" indicate that the elements or objects preceding "comprising" encompass the elements or objects listed following "comprising" or "including" and their equivalents, but do not exclude other elements or objects having the same function.

[0052] As shown in the figure, a typical embodiment of the present invention includes a base plate 1, and an outer annular baffle 2, an inner annular baffle 3, and a central annular baffle 4 concentrically mounted on the upper surface of the base plate 1. The outer annular baffle 2, the inner annular baffle 3, and the central annular baffle 4 are all hollow cylinders. A sedimentation zone is formed between the outer annular baffle 2 and the inner annular baffle 3, and a filtration zone 5 is formed between the inner annular baffle 3 and the central annular baffle 4. An outflow zone 6 is formed inside the central annular baffle 4, and an outflow port 7 is provided at the position of the base plate 1 corresponding to the outflow zone 6. Two filter plates, a first filter plate 8 and a second filter plate 9, are installed in the filtration zone 5, both filled with filter material. The collected rainwater passes through the outer annular baffle, then through the assembled filter plate and the filter plate overflow trough, and undergoes staged sedimentation through the fan-shaped sedimentation section. After sedimentation treatment in the final sedimentation zone, it enters the filtration zone for further filtration.

[0053] In one embodiment of this solution, the base plate 1 can adopt the following structure: The first embodiment is that the base plate 1 can have a flat bottom structure, with the outlet 7 installed at the center of the base plate 1, and the outer annular baffle 2, the inner annular baffle 3, and the central annular baffle 4 installed on the upper surface of the base plate 1. The second embodiment is as follows: Figure 8 As shown, the base plate 1 is generally conical in shape, and the outlet 7 is installed at the apex of the conical surface of the base plate 1, that is, the outlet 7 is located at the lowest position of the base plate 1. The outer annular baffle 2, the inner annular baffle 3, and the central annular baffle 4 are installed on the side of the base plate 1 facing away from the apex of the conical surface. The outlet 7 is located at the lowest point of the base plate 1, which can ensure that a certain pressure difference is maintained on both sides of the filter plug 24 so that water can seep from the sedimentation zone to the outlet zone 6.

[0054] In one embodiment of the present invention, a vertical structural baffle 10 is also installed on the base plate 1. One end of the vertical structural baffle 10 is connected to the outer annular baffle 2, and the other end is connected to the central annular baffle 4. The vertical structural baffle 10 is perpendicular to the base plate 1 and arranged along the radial direction of the outer annular baffle 2. Multiple assembled filter plates 11 are detachably installed in the sedimentation zone. Between two adjacent assembled filter plates 11 is a fan-shaped sedimentation section. Each sedimentation zone is composed of several fan-shaped sedimentation sections. The top of each assembled filter plate 11 is provided with a filter plate overflow groove 12. Rainwater in the sedimentation zone flows from one side of the vertical structural baffle 10 around the sedimentation zone to the other side of the vertical structural baffle 10, where it is blocked by the vertical structural baffle 10 and enters the next inner ring sedimentation zone or filtration zone to continue settling or filtering.

[0055] In this design, the central annular baffle 4 has a drain outlet 13 along its side wall. One side of the drain outlet 13 is connected to the vertical structure baffle 10, and the other end is connected to the second filter plate 9. The first filter plate 8 and the second filter plate 9 are both located in the filtration area 5 outside the central annular baffle 4 and are arranged along the radial direction of the inner annular baffle 3. The water flow first passes through the first filter plate 8 and then through the second filter plate 9 for filtration. The central angle corresponding to the opening length of the drain outlet 13 along the circumference of the central annular baffle 4 is less than 180°. The filtration zone 5 between the first and second filter plates is filled with filter materials such as quartz sand. The filter materials can adopt a certain particle size distribution to filter out most of the silt or impurities that fail to settle. In another typical embodiment of the present invention, the filter plates in the filtration zone 5 can also be implemented as follows: multiple corresponding slots are provided on the annular baffles on both sides of the filtration zone 5. The filter plate structure is multiple assembled fan-shaped hollow grid filter structures 5-1. The wide and narrow sides of the hollow grid filter structure 5-1 are tightly inserted into the corresponding annular baffle slots on the inner and outer sides. The bottom plate 1 can also be provided with a bottom structure for accommodating and cooperating with the fan-shaped hollow grid filter structure 5-1. The filter structure 5-1 features a fan-shaped groove design with an elastic sealing gasket at the bottom. The weight of the fan-shaped hollow grid filter structure 5-1 presses the elastic sealing gasket into the corresponding groove for better sealing. The water-passing surfaces on both sides of the filter structure are grid structures, while one side of the filter plate structure is a grid drawer-type side plate 5-1-1. The internal filter material of the fan-shaped hollow grid filter structure 5-1 can be replaced or cleaned by pulling out the drawer-type side plate 5-1-1. The fan-shaped hollow grid filter structure 5-1 is filled with filter material, which uses a specific particle size distribution to ensure that the filtration level of the filter structure gradually increases along the water flow direction.

[0056] In this design, an inlet device 14 is arranged on the outer wall of the outer annular baffle 2, and the inlet device 14 is located on one side of the vertical structure baffle 10. An inner baffle overflow groove 15 is provided at the top of the side of the inner annular baffle 3 that contacts the vertical structure baffle 10. The inner baffle overflow groove 15 is located on the other side of the vertical structure baffle 10 opposite to the inlet device 14, and is used to allow water in the sedimentation zone to enter the filtration zone 5 through the inner baffle overflow groove 15.

[0057] In this scheme, the size of the prefabricated grit settling device can be manufactured according to the actual needs such as local rainfall and rainwater collection tank specifications. The number of annular baffles can also be adjusted according to the actual grit settling requirements. The filter material of the filtration zone 5 should not be limited to quartz sand, etc. Structures and materials with filtration functions that meet the requirements can be used in the filtration zone 5. The outlet can be fitted with a grid device to prevent debris from falling into the rainwater collection tank and affecting water quality or causing blockage.

[0058] In this embodiment of the invention, water enters through the inlet device 14 and flows along the annular sedimentation zone to the end. As the water flows into the sedimentation zone, the water level rises continuously. Then, it flows into the filtration zone 5 along the overflow channel 15 of the inner annular baffle 3. After being filtered in the filtration zone 5, it enters the outlet zone 6 through the drain outlet 13 and finally flows out of the sedimentation device through the outlet outlet 7, leaving silt and gravel in the sedimentation device. The outlet outlet 7 is a chamfered circular vertical channel, with a polyethylene rainwater collection tank 29 below, ensuring smooth water flow in the annular sedimentation zone and reducing water accumulation.

[0059] In a typical embodiment of the present invention, a plurality of concentrically arranged intermediate annular baffles are provided between the outer annular baffle 2 and the inner annular baffle 3. The intermediate annular baffles are used to divide the sedimentation zone into multiple annular sedimentation partitions, and the width of the annular sedimentation partitions gradually decreases from the outside to the inside along their own radii. Specifically, intermediate annular baffles I16 and II17 are provided between the outer annular baffle 2 and the inner annular baffle 3. A first sedimentation zone 18 is formed between the outer annular baffle 2 and the intermediate annular baffle I16; a second sedimentation zone 19 is formed between the intermediate annular baffle I16 and the intermediate annular baffle II17; and a third sedimentation zone 20 is formed between the intermediate annular baffle II17 and the inner annular baffle 3. The outer annular baffle 2, intermediate annular baffle I16, intermediate annular baffle II17, and inner annular baffle 3 form a third sedimentation zone 20. Both the shaped baffle 3 and the central annular baffle 4 are hollow cylinders with their radii decreasing sequentially. The widths of the first settling zone 18, the second settling zone 19, and the third settling zone 20 decrease sequentially along their own radii. The width of the outer first settling zone 18 should be larger than the width of the inner second settling zone 19, and the width of the second settling zone 19 should be larger than the width of the inner third settling zone 20. The purpose of this design is to provide sufficient space for the newly arrived rainwater with a high sand content to reduce its flow velocity and increase the settling time.

[0060] In this design, the vertical baffle 10 is sequentially connected to the outer annular baffle 2, the middle annular baffle I 16, the middle annular baffle II 17, the inner annular baffle 3, and the central annular baffle 4. The prefabricated filter plate 11 includes: multiple first prefabricated filter plates 11-1 detachably installed in the first grit chamber 18 along the radial direction of the outer annular baffle 2; multiple second prefabricated filter plates 11-2 detachably installed in the second grit chamber 19 along the radial direction of the outer annular baffle 2; and multiple third prefabricated filter plates 11-3 detachably installed in the third grit chamber 20 along the radial direction of the outer annular baffle 2. The first assembled filter plate 11-1, the second assembled filter plate 11-2, and the third assembled filter plate 11-3 are used to divide the corresponding sedimentation zones into several fan-shaped sedimentation sections to enhance the sedimentation effect. Rainwater undergoes multi-stage sedimentation in each sedimentation zone. Each of the first assembled filter plate 11-1, the second assembled filter plate 11-2, and the third assembled filter plate 11-3 has an overflow groove 12 at its top. The overflow groove 12 on the first assembled filter plate 11-1 is located at its top near the middle annular baffle I 16. The overflow groove 12 on the second assembled filter plate 11-2 is located at its top near the middle annular baffle II 17. The overflow groove 12 on the third assembled filter plate 11-3 is located at its top near the inner annular baffle 3. The first assembled water filter plate 11-1, the second assembled water filter plate 11-2, and the third assembled water filter plate 11-3 are all provided with filter plug holes 23, and filter plugs 24 are installed in the filter plug holes 23. The filter plug holes 23 are located directly below the overflow groove 12 of the water filter plate, ensuring that rainwater permeates through the filter plate after passing through the filter plugs 24.

[0061] In one embodiment of the present invention, a first baffle overflow groove 21 is provided at the top of the side of the intermediate annular baffle I 16 that contacts the vertical structural baffle 10, and the first baffle overflow groove 21 is arranged on the other side of the vertical structural baffle 10 opposite to the water inlet device 14. A second baffle overflow groove 22 is provided at the top of the side of the intermediate annular baffle II 17 that contacts the vertical structural baffle 10, and the second baffle overflow groove 22 is arranged on the other side of the vertical structural baffle 10 opposite to the first baffle overflow groove 21. An inner baffle overflow groove 15 is provided at the top of the side of the inner annular baffle 3 that contacts the vertical structural baffle 10, and the inner baffle overflow groove 15 and the first baffle overflow groove 21 are located on the same side of the vertical structural baffle 10. Filter plug holes 23 are also provided on the intermediate annular baffle I 16, intermediate annular baffle II 17 and inner annular baffle 3, and filter plugs 24 are installed in the filter plug holes 23. The filter plug hole 23 is located directly below the first baffle overflow channel 21, the second baffle overflow channel 22, and the inner baffle overflow channel 15. In this design, all filter plugs 24 are hollow double-ended studs with mesh grid structures at both ends, and the filter plugs 24 are filled with filter material. The purpose of this design is that, under the blocking action of the vertical structure baffle 10, and guided by the installation positions of the filter plugs 24 and the baffle overflow channels, rainwater can continuously flow through different sedimentation zones in both clockwise and counterclockwise directions. This specific structure ensures sedimentation time and effect without causing additional disturbance to the sedimentation zone.

[0062] In this design, filter plug holes 23 are provided on the first assembled filter plate 11-1, the second assembled filter plate 11-2, and the third assembled filter plate 11-3. Filter plugs 24 are installed through the filter plug holes 23. Each filter plug 24 is a hollow polyethylene double-ended stud with a mesh grid structure at both ends. After passing through the filter plug holes 23, both ends are fixed with nuts. The filter plug 24 is filled with filter materials such as quartz sand. Water accumulated in the sedimentation zone seeps through the filter plug 24 to the next zone. The annular baffle and... The vertical distance between the opening position of all filter plug holes 23 of the assembled filter plate 11 and the bottom plate 1 should gradually decrease along the direction of water flow. This is to prevent the filter plugs 24 from being blocked when a lot of silt in the rainwater accumulates in the sedimentation area. This would prevent the water from seeping through the filter plugs 24 and cause the rainwater to remain in the sedimentation tank. The filter material filling the filter plugs 24 should be selected with a certain particle size distribution to intercept coarse silt as much as possible without clogging the filter plugs. At the same time, the seepage velocity should not be too high to prevent disturbance to the sedimentation process in the sedimentation area.

[0063] Specifically, the prefabricated filter plate 11 can be increased or decreased according to actual needs such as rainfall and flow rate, so as to increase or decrease the volume of a certain ring sand settling area to achieve a better sand settling effect. In some embodiments, the nut structure on one side of the filter plug 24 can have a mesh grid structure, and the hollow polyethylene double-ended stud has an open hole on one side, so that the nut structure with mesh grid structure can be directly threaded to replace or clean the filter material. The filter material is not limited to quartz sand, etc., and structures and materials with filtration functions can be used in the filter plug 24.

[0064] In one embodiment of the present invention (not shown), the filter plug 24 has two layers of grid structure inside along the seepage direction, dividing the filter plug 24 into three layers of sieve-like hollow cylinders. The cylinder structures at both ends are filled with small-diameter filter material, while the middle cylinder structure is hollow and unfilled. The cylinder side has internal and external molded threads, allowing the entire filter plug to be unscrewed from the threads to be divided into two sections. When water flows through the filter plug 24, most of the sediment is blocked by the small-diameter filter material. Some of the sediment entering the filter plug 24 is stored in the middle hollow cylinder, some is washed out by the water flow to the other end, and the remaining part remains in the pores of the filter material to increase the filter material gradation and achieve a better filtration effect. The sediment stored in the middle hollow cylinder can be easily removed by unscrewing the filter plug 24.

[0065] In this scheme, the water inlet device 14 includes an inlet pipe 14-1 connected to the first sedimentation zone 18 and a solenoid valve 14-2 installed on the inlet pipe 14-1. The inlet pipe 14-1 is a common polyethylene pipe. Rainwater from the rainwater collection surface flows into the inlet pipe 14-1 after collection. The cross-sectional area of ​​the inlet pipe 14-1 should be determined based on the local average maximum rainfall during the rainy season in the rainwater collection cellar, and should not be set too large to prevent excessive flow from affecting the sedimentation efficiency of the sedimentation device. In this embodiment, the cross-sectional area of ​​the inlet pipe 14-1 is set as a circle with a radius of 3cm. When the inlet flow velocity reaches 0.05m / s, approximately 1m³ of sediment can be collected in about 120 minutes. 3 rainwater.

[0066] In this invention, an electromagnetic valve 14-2 is installed near the outer annular baffle 2 on the inlet pipe 14-1. The electromagnetic valve 14-2 controls the flow rate of the inlet device 14. The tail end of the inlet pipe 14-1 is connected to the inlet hole of the outer annular baffle 2 via a flexible connector. Specifically, a filter device such as a screen can also be installed at the front end of the electromagnetic valve 14-2 at the inlet to prevent a large amount of impurities carried during the confluence process from entering the sedimentation device and affecting the sedimentation effect. A float level switch 25 is also installed in the outlet zone 6, and the float level switch 25 is signal-connected to the electromagnetic valve 14-2. The float level switch 25 has different length models for different specifications of sedimentation devices and is installed on the side wall of the outlet zone 6. The float level switch 25 is located at the upper edge of the outflow zone 6. When the sedimentation process is blocked or the rainwater collection tank 29 is full, causing the water level in the outflow zone 6 to rise to a certain height, the float level switch 25 transmits a closing signal to the solenoid valve 14-2. At this time, the solenoid valve 14-2 closes, and no more rainwater enters the sedimentation device. When the water level drops to a certain height, it transmits an opening signal to the solenoid valve 14-2, at which time the solenoid valve 14-2 reopens, and rainwater can re-enter the sedimentation device. Specifically, to achieve the same control effect as the solenoid valve 14-2, the float level switch 25 can also be replaced with a tuning fork type or a capacitive type level switch.

[0067] In this invention, assembled filter plate mounting grooves 26 are arranged on the inner side of the outer annular baffle 2, the inner and outer sides of the middle annular baffle I 16, the inner and outer sides of the middle annular baffle II 17, and the outer side of the inner annular baffle 3. The first assembled filter plate 11-1, the second assembled filter plate 11-2, and the third assembled filter plate 11-3 are tightly connected to the outer annular baffle 2, the middle annular baffle I 16, the middle annular baffle II 17, and the inner annular baffle 3 through the assembled filter plate mounting groove 26. This prevents water from flowing into the lower fan ring grit section from the side wall connection. After a period of use, the assembled filter plates can be removed for easy sand removal. When reconnecting, they can be horizontally reversed to achieve the effect of backwashing the filter plug. To further ensure the airtightness of the contact surface between the assembled filter plate and the bottom plate 1, an elastic sealing gasket is provided on the bottom edge of the assembled filter plate. The weight of the assembled filter plate itself presses the elastic sealing gasket tightly. At the same time, a groove that matches the shape of the bottom edge structure of the assembled filter plate can be provided on the bottom plate to press the elastic sealing gasket into the groove for better sealing of the bottom edge.

[0068] In this design, the outer edge of the outer annular baffle 2 is flush with the edge of the base plate 1, and a top cover 9 (not shown in the figure) is fitted over the outer annular baffle 2. This prevents rain or airborne impurities from disturbing the sedimentation process of the sedimentation device or causing additional pollution to the water. A pair of handles 27 are symmetrically provided on the outer perimeter of the side wall of the outer annular baffle 2. The handles 27 facilitate the movement of the assembled sedimentation device, allowing operators to easily install or disassemble it. A cylindrical base 28 is also installed on the outer side of the base plate 1 for connecting the sedimentation device and the rainwater collection tank 29.

[0069] In this scheme, to facilitate the cleaning of filtered silt and impurities in the settling zone, after manual cleaning, a small amount of silt remaining at the bottom can be rinsed with a small amount of water. In the first settling zone 18, the second settling zone 19, and the third settling zone 20, sand discharge channels 16 are provided on the bottom plate near the vertical structural baffle 10. The sand discharge channels 16 are composed of a hollow semi-cylindrical structure at the connection between the bottom of the vertical structural baffle 10 and the bottom plate. Furthermore, each sand discharge channel 16 has a sand discharge port 15 at the end of each settling zone near the inner annular baffle 3. The sand discharge port 15 is used during the settling process. The system can be sealed with a stopcock. When flushing is required, the stopcock can be opened to connect the various sedimentation zones and the sand discharge channel. A small amount of water can be used to flush the bottom plate of the sedimentation zone, while the water mixed with mud and sand is discharged into the sand discharge channel 16 through the sand discharge port 15 and finally discharged through the sand discharge channel 16. A control valve can also be installed at the end of the sand discharge channel 16. For example, the sand discharge port 15 of the first sedimentation zone 18 is located on the other side of the vertical structure baffle 10 of the water inlet device 14, while the sand discharge port 15 of the second sedimentation zone 19 is located on the same side of the vertical structure baffle 10 of the water inlet device 14, and the third sedimentation zone 2... The sand discharge port 15 of the 0 structure is equipped with a water inlet device 14 located on the other side of the vertical structure baffle 10. A control valve is installed at the end of the sand discharge channel. During normal settling, the plug can be used to seal the sand discharge port 15, and the control valve can be closed at the same time, thereby sealing the sand discharge channel and providing a secondary seal. When it is necessary to flush the bottom mud and sand, the plug can be removed, which opens the control valve of the sand discharge port 15 and the sand discharge channel 16, and a small amount of flushing water is used to discharge the mud and sand through the sand discharge port 15 and the sand discharge channel 16 to the sand settling device. Considering that when the bottom plate is a conical structure, the sand discharge channel 1... The end of the 6th section near the center of the conical structure is lower, so this end of the sand discharge channel 16 is used as the discharge end. The control valve can be set as an automatic control valve, or it can be led out through a pipe to make the sand discharge more complete. When it is set as a manual control valve, the manual control valve can be set at the end of the pipe leading out at this point, which is located on the outside, so as to facilitate manual operation and control. When the bottom plate 1 adopts a flat bottom structure, the side of the sand discharge channel near the edge of the bottom plate 1 can be set as the discharge end, and a control valve can be set at this end. The principle is similar to that above, and will not be described again.

[0070] The present invention also provides a rainwater collection tank with an assembled sedimentation device, including the sedimentation device and the rainwater collection tank 29 in the above embodiments. The top opening of the rainwater collection tank 29 is connected to the bottom cylindrical base 28 of the base plate 1, thereby connecting the rainwater collection tank 29 with the outlet 7. The rainwater filtered by the sedimentation device finally enters the rainwater collection tank 29 through the outlet 7 for collection. Prefabricated filter plate mounting grooves 26 are arranged on the inner side of the outer annular baffle 2, the inner and outer sides of the middle annular baffle I 16, the inner and outer sides of the middle annular baffle II 17, and the outer side of the inner annular baffle 3. The prefabricated filter plate mounting grooves 26 are molded and are inserted into the prefabricated filter plate 11 to divide the annular sedimentation area into multi-stage fan-shaped sedimentation sections. The mud or impurities in the rainwater can achieve multi-stage sedimentation in the fan-shaped sedimentation area. The cylindrical base 28 should be set on the bottom surface of the bottom plate 1 of the annular sedimentation channel, and its size should be consistent with the local rainwater collection tank opening in order to fix the sedimentation device.

[0071] The present invention also provides a rainwater collection method using a rainwater collection tank with a prefabricated sedimentation device as described above, the specific steps of which are as follows:

[0072] Step 1: Water flows from the inlet device 14 into the space between the outer annular baffle 2 and the middle annular baffle I 16 to form the first sedimentation zone 18. Then, it moves along the outer wall of the middle annular baffle I 16. After encountering the first assembled filter plate 11-1, when the water level is low, the water flows directly from the filter plug 24 to the next annular sedimentation section. The filter material or filter structure in the filter plug 24 directly filters the rainwater. After the water level reaches the height of the overflow groove 12 opened at the top of the first assembled filter plate 11-1, the water flows from the overflow groove 12 to the next annular sedimentation section. The silt and gravel remain in front of the first assembled filter plate 11-1.

[0073] Step 2: After passing through multiple first assembled filter plates 11-1, the water flows through the first baffle overflow groove 21 and filter plug 24 into the second sedimentation zone 19 formed between the intermediate annular baffle I 16 and the intermediate annular baffle II 17. Then, it moves along the outer wall of the intermediate annular baffle II 17. When it encounters the second assembled filter plate 11-2, if the water level is low, the water flows directly from the filter plug 24 to the next annular sedimentation section. When the water level reaches the height of the filter plate overflow groove 12 opened at the top of the second assembled filter plate 11-2, the water flows from the filter plate overflow groove 12 to the next annular sedimentation section. The water flows through the filter plate overflow groove 12 opened at the top of the second assembled filter plate 11-2 and the filter plug 24, while the silt and gravel remain in front of the second assembled filter plate 11-2.

[0074] Step 3: After passing through multiple second assembled filter plates 11-2, the water flows through the second baffle overflow groove 22 and filter plug 24 into the third sedimentation zone 20 formed between the middle annular baffle II 17 and the inner annular baffle 3. Then, it advances along the outer wall of the inner annular baffle 3. When it encounters the third assembled filter plate 11-3, if the water level is low, the water flows directly from the filter plug 24 to the next annular sedimentation section. After the water level reaches the height of the filter plate overflow groove 12 opened at the top of the second assembled filter plate 11-3, the water flows from the filter plate overflow groove 12 to the next annular sedimentation section. The water flows through the filter plate overflow groove 12 opened at the top of the third assembled filter plate 11-3 and the filter plug 24. The silt and gravel remain in front of the third assembled filter plate 11-3.

[0075] Step 4: After passing through multiple third-assembly filter plates 11-3, the water flows through the inner baffle overflow channel 15 and filter plug 24 into the filtration zone 5 formed between the inner annular baffle 3 and the central annular baffle 4. It then proceeds along the outer wall of the central annular baffle 4, encountering the first filter plate 8 and the second filter plate 9. The filtration zone 5 between the two filter plates is filled with filter materials such as quartz sand. The filter materials should have a certain particle size distribution to filter out most of the silt or impurities that cannot be deposited. After filtration, the water flows into the bottom of the outflow zone 6. The water flows into the rainwater collection tank 29 through the central outlet 7. The float level switch 25 is used to detect the water level in the outflow zone 6 and sends the water level signal to the solenoid valve 14-2. When the sedimentation process is blocked or the rainwater collection tank is full of rainwater, causing the water level in the outflow zone to rise to a certain height, the float level switch 25 sends a closing signal to the solenoid valve 14-2, at which time the solenoid valve 14-2 is closed. When the water level drops to a certain height, it sends an opening signal to the solenoid valve 14-2, at which time the solenoid valve 14-2 is opened, and rainwater can enter the sedimentation device.

[0076] Step 5: After the rain stops and the water inlet pipe 14-1 stops supplying water, the water in the sedimentation zone can seep through the filter plug 24 to the next sedimentation zone. The water in the last sedimentation zone seeps through the filter plug 24 to the filter zone 5 and the outlet zone 6. After being filtered by the filter zone 5, the water enters the rainwater collection tank 29 from the outlet 7. The outlet 7 is located at the lowest point of the entire sedimentation device to ensure that a certain pressure difference is maintained on both sides of the filter plug 24 so that the water can seep from the sedimentation zone to the filter zone 5 and the outlet zone 6.

[0077] To achieve better results, this solution also considers the ease of cleaning mud and sand after settling. Manually disassembling and installing each prefabricated filter plate would be labor-intensive. Therefore, the first prefabricated filter plate 11-1, the second prefabricated filter plate 11-2, and the third prefabricated filter plate 11-3 can all be installed in the prefabricated filter plate mounting slots 26 using an automatic lifting mechanism. Specifically, the following structure can be adopted: a lifting push rod is installed at the position of the base plate 1 corresponding to the prefabricated filter plate mounting slot 26. The base of the lifting push rod is fixedly connected to the base plate. The lifting push rods are located in the prefabricated filter plate mounting slots 26 on both sides, and their telescopic ends are fixedly connected to both sides of the first prefabricated filter plate 11-1, the second prefabricated filter plate 11-2, and the third prefabricated filter plate 11-3. The extension and retraction of the lifting push rods pushes the first, second, and third prefabricated filter plates to rise and fall, thereby facilitating the lifting and lowering of the first, second, and third prefabricated filter plates. A channel gap is formed between the filter plate and the bottom of the sedimentation zone to facilitate the cleaning and rinsing of mud and sand. To ensure the convenience of the extension and retraction of the lifting push rod, a certain gap is required between the first, second, and third assembled filter plates and the assembled filter plate mounting groove. Therefore, a sealing structure is required. This sealing structure includes an air bladder and an air bladder slot. Each assembled filter plate frame is provided with an air bladder mounting groove. The air bladder slots are located on the two vertical sides and the bottom side of each assembled filter plate frame and are designed to be integrally connected. A retractable air bladder is provided in the air bladder slot of the assembled filter plate frame. When the air bladder is deflated, it contracts and enters the air bladder slot, separating from the inner wall of the assembled filter plate mounting groove. At this time, it is convenient for the first, second, and third assembled filter plates to be lifted. The bottom of the assembled filter plate and the bottom plate form a cleaning and rinsing channel. At this time, a small amount of water is used to rinse the sedimentation zone and the water is discharged through the sand discharge port. After the first, second, and third assembled filter plates descend to their base plate assembly positions in the assembled filter plate mounting slots, gas is introduced into the air bladders. The air bladders inflate from their slot openings, tightly fitting into the assembled filter plate mounting slots. This seals the assembly gaps between the assembled filter plates and the mounting slots, preventing sediment from passing through these gaps during settling. This solution reduces workload while ensuring effective settling in each sedimentation section, preventing sediment from directly passing through gaps. One end of the air supply hose connects to the air pump, and the other end connects to the air bladders on both sides of the first, second, and third assembled filter plates. The air supply hose can be installed along the annular length of the outer annular baffle, the middle annular baffle I, the middle annular baffle II, and the inner annular baffle.

[0078] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A prefabricated sedimentation device, characterized in that: It includes a base plate and, from the outside to the inside, concentrically arranged outer annular baffles, inner annular baffles, central annular baffles, and vertical structural baffles. The outer annular baffle is equipped with a water inlet device, and a sedimentation zone is formed between the outer and inner annular baffles. Multiple assembled filter plates are detachably installed in the sedimentation zone. Each assembled filter plate has a filter plug hole, and a filter plug is installed in the filter plug hole. Each assembled filter plate has an overflow groove at its top. The filter plug is located below the overflow groove of the filter plate. A filtration zone is formed between the inner annular baffle and the central annular baffle, and several filter plates are arranged in the filtration zone along the water flow direction. An outflow zone is formed inside the central annular baffle, and an outflow port for discharging water is opened on the bottom plate corresponding to the outflow zone. One end of the vertical structure baffle is connected to the outer annular baffle, and the other end is connected to the central annular baffle. The vertical structure baffle is perpendicular to the bottom plate and arranged along the radial direction of the outer annular baffle. The water inlet device is located on the outer annular baffle on the side close to the vertical structure baffle. A plurality of concentrically arranged intermediate annular baffles are provided between the outer annular baffle and the inner annular baffle. The intermediate annular baffles are used to divide the space between the outer annular baffle and the inner annular baffle into multiple annular sedimentation zones. The width of the annular sedimentation zones gradually decreases from the outside to the inside along their own radius. The intermediate annular baffle includes intermediate annular baffle I and intermediate annular baffle II, wherein a first sedimentation zone is formed between the outer annular baffle and intermediate annular baffle I; a second sedimentation zone is formed between intermediate annular baffle I and intermediate annular baffle II; and a third sedimentation zone is formed between intermediate annular baffle II and inner annular baffle.

2. The prefabricated grit settling device according to claim 1, characterized in that: The outer annular baffle, the middle annular baffle I, the middle annular baffle II, the inner annular baffle, and the central annular baffle are all hollow cylinders with their radii decreasing sequentially. The widths of the first, second, and third sedimentation zones decrease sequentially along their own radii. The vertical structure baffles are connected to the outer annular baffle, the middle annular baffle I, the middle annular baffle II, the inner annular baffle, and the central annular baffle.

3. The prefabricated grit settling device according to claim 1, characterized in that: Within the first sedimentation zone, several first prefabricated filter plates are detachably installed radially along the outer annular baffle. Within the second sedimentation zone, several second assembled filter plates are detachably installed radially along the outer annular baffle. Within the third sedimentation zone, several third prefabricated filter plates are detachably installed radially along the outer annular baffle. The top of the first assembled water filter plate, the second assembled water filter plate, and the third assembled water filter plate are all provided with water filter plate overflow grooves; The top of the side of the middle annular baffle I that contacts the vertical structural baffle is provided with a first baffle overflow groove, and the first baffle overflow groove is arranged on the other side of the vertical structural baffle opposite to the water inlet device. A second baffle overflow groove is provided at the top of the side of the middle annular baffle II that contacts the vertical structural baffle. The second baffle overflow groove is arranged on the other side of the vertical structural baffle relative to the first baffle overflow groove. An inner baffle overflow groove is provided at the top of the side of the inner annular baffle that contacts the vertical structural baffle. The inner baffle overflow groove and the first baffle overflow groove are located on the same side of the vertical structural baffle.

4. The prefabricated grit settling device according to claim 1, characterized in that: The central annular baffle has a drain outlet on its sidewall, and the central angle corresponding to the opening length of the drain outlet along the circumference of the central annular baffle is less than 180°. Several filter plates are arranged in the filtration zone, and the filter plates are arranged radially along the central annular baffle. One side of the drain outlet is connected to a vertical structural baffle, and the other side is connected to one of the filter plates.

5. A prefabricated grit settling device according to claim 1, characterized in that: The water inlet device includes an inlet pipe and a solenoid valve. The solenoid valve is used to control the opening and closing of the inlet pipe. A level switch is also installed in the outlet zone. The level switch is used to detect the liquid level in the outlet zone and send the liquid level signal to the solenoid valve. When the sedimentation process is blocked or the rainwater collection tank is full of rainwater, causing the water level in the outlet zone to rise to a certain height, the level switch sends a closing signal to the solenoid valve, at which point the solenoid valve closes. When the water level drops to a certain height, it sends an opening signal to the solenoid valve, at which point the solenoid valve opens again, and rainwater can re-enter the sedimentation device.

6. A rainwater collection tank with a prefabricated sedimentation device, comprising a rainwater collection tank, characterized in that, It also includes a prefabricated sedimentation device as described in any one of claims 1-5; the top of the rain collection bucket is connected to the bottom of the base plate, and the rain collection bucket is connected to the outlet.

7. A rainwater collection method using a rainwater collection tank with a prefabricated sedimentation device as described in claim 6, characterized in that: The specific steps are as follows: Step 1: Water flows from the inlet device into the first sedimentation zone between the outer annular baffle and the middle annular baffle I. It then moves along the first sedimentation zone and encounters the first assembled filter plate. When the water level is low, the water can directly seep from the filter plug to the next annular sedimentation section. The filter plug is used to directly filter the rainwater. When the water level reaches the height of the overflow groove at the top of the first assembled filter plate, the water overflows from the overflow groove to the next annular sedimentation section. Silt and gravel remain in front of the first assembled filter plate. Step 2: After passing through multiple first assembled filter plates, the water flows through the first baffle overflow channel and filter plug into the second sedimentation zone between the middle annular baffle I and the middle annular baffle II to continue settling, while silt and gravel are left in front of the second assembled filter plates. Step 3: After passing through multiple second-assembly filter plates, the water flows through the second baffle overflow channel and filter plug into the third sedimentation zone between the middle annular baffle II and the inner annular baffle to continue settling, while silt and gravel are left in front of the third-assembly filter plate. Step 4: After passing through multiple third-assembly filter plates, the water flows through the inner baffle overflow channel and filter plug into the filtration zone between the inner annular baffle and the central annular baffle. Then it continues to move along the filtration zone, and after passing through the filter plates, most of the mud or impurities that could not be deposited are filtered out. After filtration, the water flows into the outlet at the bottom center of the outflow zone and enters the rainwater collection bucket. Step 5: After the rainfall ends and the inlet pipe stops supplying water, the water in the sedimentation zone can seep through the filter plug to the next sedimentation zone. The water in the last sedimentation zone seeps through the filter plug to the filtration zone and the outlet zone. After being filtered by the filtration zone, the water enters the rainwater collection tank from the outlet.

8. The rainwater harvesting method according to claim 7, characterized in that: In step four, the level switch is used to detect the liquid level in the outflow zone and send the liquid level signal to the solenoid valve. When the sedimentation process is blocked or the rainwater collection tank is full of rainwater, causing the water level in the outflow zone to rise to a certain height, the level switch sends a closing signal to the solenoid valve, at which point the solenoid valve closes. When the water level drops to a certain height, it sends an opening signal to the solenoid valve, at which point the solenoid valve opens, and rainwater can enter the sedimentation device.

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